Question

Is too much running hazardous to your health?  A random sample of 32 ultra-runners lives to the age of 75.  The average life expectancy in the U.S. is 79 with a standard deviation of 8.7 years.      

1. State the appropriate null and alternative hypotheses.  
2. Compute the z-test statistic.  
3. Use the z-test statistic to draw and shade a normal distribution, indicating relevant rejection zone(s).
4. What is the p-value associated with the hypothesis test?  

Explain the results of your hypothesis test, using relevant confidence levels.

Answer 1